Dieing machine



Junes, 1943.

c. F. SHERMAN ET AL 2,321,325

DIEING MACHINE Filed Aug. 5, 1940 2 sheets-sheet 1 2 sheds-sheet 2 M 9 .M n 4 5 ....22 .75 f

l@IIIIII .n li F, fik f VL. m@ l/ June 8, 1943.

Filed Aug. 5, 1940 l .s 1I.. 5 ,a n u M Patented June 8, 1943 Cortis F. Sherman,` West Hartfordyand Alfred E. Caserta, Hartford', Conn., assignorsfto" The. 'Henry it4 Wright Manufacturing- Company,

Hartford, Conni., a corporation ofl Connecticutl Applicatien August 3, 194A),4 Serial No. 350,210

7 Claims.

Our invention relates tothe class of machines that are commonly employed: for stamping or cutting metallic articles from strips. of sheet metal, and an object of vour invention, among others, is' toincreaset-he capacityv of machines of this type by increasing the speedat whichthey may be operated; this beingaccomplishediin` the ma.'- chine as shown herein by counterbal'ancing the reciprocating members ofthe machine in opposition to the forces applied by anl actuating. crank shaft thereby reducing and substantially eliminating conditions due to` inertia.

One form of a machine. embodying the inventionand in the-construction and use of which the objects herein set: out, as: Well as othersmay be attained is illustratedin the yaccompanying.drawings,.in which- Figure 1 is a sectional View in elevation on a plane denote'dby the broken line |-I of' Fig; 2.'

Figure 2 a' similar View partially'on a plane denotedby the broken line---Z- oi'Fig. 1.

Figure 3 is= a' ViewV in horizontal section ona plan'e-denotedby` the broken line 3*-31ofliig. l.

Figure 4 is an isometric view illustrating the actuating shaft andthe counterbalancingv mechanism carried thereby, thecounterbalance guide. onY the near side being' broken construction.

Figure 5 is a-side View ofthe machine showing construction and operation, so far as a general' description is concerned, such machine comprising a frame including a base 9 with supports Ill rising therefrom at the lower end of the frame, and avtable IIY at its upper end for the support of deing mechanism. A crank shaft I2 's'mounte ed in the frame between the base Sla-nd table H, this shaft being drivenv inv any ordinary manner by power appliedthereto in any suitable Way and not specifically shown herein, as such driving' means Will be readily understood by those skilled in the art and is not necessary for a clear 'understanding of the invention. TheV crank shaft is operatively connected in a. manner to be hereinafter described with a punch I3.V and its holder away' to showvv I 4j said connection including rodsl5y fastened atVv their lower ends to a cross head l mounted for Vertical reciprocating movement below the crank I2I ofithe crankshaft I2', saidreciprocating'A movement being imparted to the cross head byt meansof a connecting. rod Il in amanner com-4 mon to. machines of! this type, and as will be readily' understood'.

In this',.ourimproved machine, the weight; of

the punching mechanism, comprising the punch:

I3, punch holder I4',` rods I5', cross headv I6 and' connecting rod I'lV is.' counterbalan'ced andineutralized: by a counterbalancing member or weight I3', vhereinafter' referred to asf a counterbalance.

frame. fromiV counterbalancing offsets I9 formed' preferably integral' With the crankshaft lf2, and preferably orr, oppositey sides of the crank I2' and' outside of the; bearings for said shaft. Theseoisets are located directly opposite' each other endwisev on the crank shafti andin positions 180 from the crankv I2"so.that when the crosshead I6 and4 the members'. of the. punch. mechanism carried'therelo'y and` hereinbefore mentioned are moved in one diurectionjthel counter-balance is moved-in. a directly'opposite` direction.

Strapsk `2.0Vare mounted on the offsets I9 andl have ears 2I each to receive the outer end of a suspension pin` 22, said pins being secured to and projecting outwardly from suspensionr blocks .23Vv

securedy as by means of screws to the counterbalance' on opposite sides of guide slots 24v eX-v tending; through opposite walls of the counter-r balance, as shown in Figures 2v and 4'. Guides 25 secured as by means of pins or screWsZB tok the ysupports I il I proiect throughA the guide yslots 24v as a means for guiding the counterb'alancein itsv vertical reciprocating movements. The guides 25 aregrooved'onopposite sides'. to receive guide ribs 21' extending along. opposite sides of each of the guide slots 21.4. These' guides 25' not only extend through the guide slots 2li' but they project into guide grooves 28 formed in opposite sides of thecross head'las a means for guiding said cross head in its vertical reciprocating movements, the-guides 25, therefore, serving the double purpose as guides for the counterbalance and the cross head.

It is contemplated'that the counterbalance will be of substantially the same Weight as the cross head I6 and the punchv mechanism supported thereby andv thereon so thatat no time will thereexist the property of inertia for any of the moving parts, the same amount of power being required at all times to effect the operation of the mechanlsm.

In the operation of our improved dieing machine illustrated and described herein it has heretofore been common practice to employ an automatic feed for the strip of stock 29 to the punches, this mechanism comprising a set of supporting rolls 30 mounted above a set of feed rolls 3|, the latter rolls being carried on opposite ends of a feed bar 32 mounted for reciprocating movement relative to the table of the machine. 'Ihese feed rolls are mounted in a well known manner to intermittently release and grip the strip 29 between the two sets of rolls {i6-3|, move it along by a step-by-step movement, and to impart no movement to the strip during the backward movement of said bar for the next succeeding feeding grip.

In the operation to position the strip of stock between the dies a row of pilot holes is made in the strip by a pilot punch 33, these holes being spaced all the same distances apart along the edge of the strip. In order to keep the strip positioned properly at all times, a pilot not herein shown carried by the punch enters each of the pilot holes when the strip is released from the grip of the feed rolls, and the strip being loose at this time is readily positioned by the action of the pilot. This action of the pilot is to ensure that no slight disarrangement of the strip of stock will take place and that said strip will always remain in proper position for the reason that should the strip be slightly disarranged when the pilot enters a pilot hole ay burr may be formed on theedge of thehole and this is undesirable. In order'to avoid such a. contingency we have provided means for adjusting the position of the feed rolls while the machine is in operation so that the pilot may be caused to clearly enter the holes at each downward movement of the punch.

This mechanism comprises a particular arrangement or construction of the feed lever 35 of the machine. The upper end of the lever 35, as heretofore, is connected by a link 35 with the feed bar 32 as shown in Fig.l5. This lever, as heretofore, is pivotally mounted at its lower end and is 'connected intermediate its ends with the crank shaft I2.

In effecting our purpose we provide an eccentric bearing 31 which is rotatably supported in the frame at its lower end adjacent the base 9. This bearing has a Worm wheel 38 rigid therewith and which meshes with a worm 39 secured to and rotatable with a worm shaft 49 mounted in a frame 4| within which the eccentric bearing 31 is also mounted. A pivot pin 42 is eccentrically positioned on the eccentric bearing 31, and the feed lever 35 is pivotally mounted at its lower end on said pivot pin. The end of the shaft 49 may be squared, as shown in Fig. 5, to receive a wrench or other tool as a means for turning the shaft for adjusting purposes.

The lever 35 has a slot 43 within which a slide 44 is located, the latter receiving a crank pin 45 projecting from the end of the crank shaft and serving in its operation to impart reciprocating movement to the lever 35 on its fulcrum or pivot 42.

From this construction it Will be seen that by the application of a wrench to the end of the shaft 40, the eccentric bearing 31 and the pivot pin 42 eccentrically mounted thereon may be rotated so that the pivot point of the lever 35 will be changed, thereby varying the throw of the upper end of the lever and consequently varying the degree of movement of the feed bar 32 and the feed rolls thereon, and with the machine in operation this adjustment may be made until the pilot is found to accurately enter the pilot holes.

In the structure shown in Fig. 6 the feed bar 32 and mechanism supported thereon and operated thereby are the same as in the device of Fig.'5. The feed lever 35 is mounted on the machine frame as heretofore and is connected with the feed bar 32 intermediate the ends of the latter, as shown in Fig. 6.

A link 46 is connected at one end with the slide 44 of the lever, as heretofore. The opposite end of the link 46 is adjustably secured in a slot 41 in a rocker 48 pivotally mounted at its upper end in a bracket 49 secured to the frame of the machine. Oscillating movement is imparted to the rocker by means of a crank pin 50 projecting from the side of a gear 5| rotatably mounted on the bracket 4|) and meshing with an intermediate gear 52 also rotatably mounted on the machine frame and in mesh with a driving gear 53 operatively connected With and driven by the crank shaft I2 of the machine.

'I'he gears 5| and 53 are timed to rotate at' substantially the same speeds and the gear 53` being driven by the crank shaft imparts movement to the gear 5| at the same speed, and the pin 50 on the gear 5| engaging the rocker 48 imparts reciprocating movement thereto which is transmitted through the link 46 to the feed lever 35 and thence to the feed bar 32 and feed rolls 3|. As hereinbefore explained the construction is such that the feeding action is intermittent and it takes place during substantially vof each rotating movement of the crank shaft.

It is generally understood that one revolution (360) of the crank shaft constitutes one cycle of operation of the punch press and during a cycle a certain percentage of the time is used in feeding the stock. By referring to Figure 7 which diagrammatically shows the feeding lever 35 as it appears in Figure 5 it will be seen that the proportion of feed to the full cycle of the press is about 19%60 of a cycle, whereas the diagram of Figure 8 shows the feeding lever rocker 48 as seen in Figure 6 and illustrates the proportion of feed to the full cycle of the about 12o/360 of the cycle.

The feeding arrangement shown in Figures 5 and '1 is found satisfactory in certain types of work, as for instance plain blanking, shearing &c., whereas the feeding arrangement as shown in Figures 6 and 8 is of advantage in certain types of work, such as forming and drawing or where a large proportion of the cycle is required for such work.

In accordance with the provisions of the patent statutes we have described the principles of operation of our invention, together with the device which we now consider to represent the best embodiment thereof, but We desire to have it understood that the device shown is only illustrative and that the invention may be carried out by other means and applied to uses other than those above set out.

We claim:

1. A dieing machine comprising a frame including a base at the lower part and a table or support for a die at the tcp thereof, an actupunch press as being support, and a set of reciprocating members including a cross head mounted on guides in the base below the shaft and arranged to be reciprocated by the latter through a suitable connection, a plurality of rods fastened in said cross head and extending upwardly through bearings in the top of the frame, a plate fastened to the rods above the die support and adapted to receive a cooperative die, means formed separately from any operative parts of the machine and acting solely as a counterweight to counterbalance the said reciprocating members and connection, said counterbalancing means being located within the confines of said frame below the die support, and a suspending connection between said counterweight and operative parts above it.

2. A dieing machine comprising a frame including a base at the lower part and a table or support for a die at the top thereof, an actuating shaft journaled in the frame below the die support, and a set of reciprocating members including a cross head mounted on guides in the base below the shaft and arranged to be reciprocated by the latter through a suitable connection, a plurality of rods fastened in said cross head and extending upwardly through bearings in the top of the frame, a plate fastened to the rods above the die support and adapted to receive a cooperative die, means formed separately from any operative parts of the machine and acting solely as a counterweight to counterbalance the said reciprocating members and connection, said counterbalancing means being located within the confines of said frame below said actuating shaft,

and a suspending connection between said counterweight and said actuating shaft above it.

3. A dieing machine comprising a frame including a base at the lower part and a table or support for a die at the top thereof, an actuating shaft journaled in the frame below the die support, and a set of reciprocating members including a supporting cross head mounted on guides in the base below the shaft and arranged to be reciprocated by the latter through a suitable connection, a plurality of rods fastened in said cross head and extending upwardly through bearings in the top of the frame, a plate fastened to the rods above the die support and adapted to receive a cooperative die, and means to counterbalance the said reciprocating members and connection, said counterbalancing means comprising a counterbalance mounted on said guides, a connection between the counterbalance and said actuating shaft, and means on said actuating shaft to reciprocate said counterbalance and cross head simultaneously, parallel to but in opposite directions, to each other.

4. A dieing machine comprising a frame having a chamber therein and including a base and a table or support, a die mounted on the table, an actuating shaft journaled in the frame below the top of said table or support, a set of reciprocating members including a punch to cooperate with said die above said shaft and also including a cross-head mounted on guides in the frame below the shaft, a connection between said shaft and said members for operation of the latter by the former, a counterbalancing weight fitted within said chamber in the frame and having vertical reciprocating movement therein, means within the base to guide said counterweight in its reciprocating movement, and a connection between said shaft and said weight, for operation of the latter by the former to counterbalance the weight of said reciprocating members.

5. A dieing machine comprising a frame having a chamber therein and including a base and a table or support, a die mounted on the table, an actuating shaft journaled inthe frame below the top of said table or support, a set of reciprocating members including a punch to cooperate with said die above said shaft and also including a cross-head mounted on guides in the frame below the shaft, a connection between said shaft and said members for operation of the latter by the former, and a counterbalancing weight located within said chamber and suspended from said shaft, said suspension including means for imparting reciprocating movement to the counterbalancing weight in opposition to the weight of said reciprocating members.

6. A dieing machine comprising a frame including a base and a table or support, a die mounted on the table, an actuating shaft journaled in the frame and having eccentrics thereon, a set of reciprocating members including a punch to cooperate with said die above said shaft and also including a cross-head mounted on guides in the frame below the shaft, a connection between one of said eccentrics and said reciprocating members for operation of the latter by the former, and a counterbalancing weight supported by the frame and guided thereby for reciprocating movement in the chamber in the frame and suspended from the other of said eccentrics to counterbalance the weight of said reciprocating members.

7. A dieing machine comprising a frame including a base and a table or support, a die mounted on the table, an actuating shaft journaled in the frame below said table or support, a set of reciprocating members including a punch to cooperate with said die above said shaft and also including a cross-head mounted for reciprocating movement in the frame below said shaft, a guide engaged with said cross-head to guide its reciprocating movement, a connection between said shaft and said members for operation of the latter by the former, a counterbalancing weight suspended from the shaft within the frame and connected with the shaft for reciprocating movement thereby in opposition to the weight of said reciprocating members, and a connection between said guide and counterbalancing weight to guide the movements of the latter.

CORTIS F. SHERMAN. ALFRED E. CASERTA. 

